Do keep in mind that I am 2726 miles north of your current location so there are some pretty big differences between your grow environment and mine - namely the temperature. I'd imagin that you can get away with potting up to the largest pot available from seedling and limit the watering. I'd guess that the rootball would stay warm and your plant will grow. That doesn't work in my area. The OP's question was if he could go from cell to a 6" 1 gallon pot. If I were to do that I'd end up with a slime covered pot and a stunted plant because the pot would stay wet far too long (especially in coir), and the cold rootball would stunt growth.
On the other hand, if I keep the pot size reasonable and allow the plant to develop a little more before I move them to larger pot I'm able to balance things out. I use the general rule of thumb whereby I double the pot size every time I pot them up. When I do it this way I end up with a rootball that is large enough to utilize the nutrient solution effectively while still watering daily at first, then move to multiple times a day as the plant develops and fills the pot. The plant stays a manageable size and I avoid slime and mould altogether. It also allows me to put a nearly fully mature plant out to soak up the sun for the 90 days I get for a grow season. I've also noticed that there is definitely an upper limit to the pot size for my region. If I follow the above method I can get away with a 3G fabric pot. Anything larger means my plant spends most of it's time developing roots and growing the upper rather than putting out pods.
Neil
On the other hand, if I keep the pot size reasonable and allow the plant to develop a little more before I move them to larger pot I'm able to balance things out. I use the general rule of thumb whereby I double the pot size every time I pot them up. When I do it this way I end up with a rootball that is large enough to utilize the nutrient solution effectively while still watering daily at first, then move to multiple times a day as the plant develops and fills the pot. The plant stays a manageable size and I avoid slime and mould altogether. It also allows me to put a nearly fully mature plant out to soak up the sun for the 90 days I get for a grow season. I've also noticed that there is definitely an upper limit to the pot size for my region. If I follow the above method I can get away with a 3G fabric pot. Anything larger means my plant spends most of it's time developing roots and growing the upper rather than putting out pods.
Neil